低级变质作用（low grade metamorphism）是指在较低温度下，相当于绿片岩相的变质作用。代表性矿物组合为绿泥石+白云母。典型标志矿物为红柱石、堇青石、十字石、纤黝帘石 低级变质作用及典型标志矿物(6张) 等，不出现蓝晶石、蓝闪石、硬柱石等。
强调指出进一步研究极低级变质作用和极低级变质带的必要性。
It is argued that further research on the very-low-grade metamorphism and metamorphic belts would be worthwhile.
并认为区域极低级变质作用主要源于印支造山前的成岩(埋藏)变质作用。
And the extremely weak regional metamorphism should be pre-Indosinian diagenic (burial) metamorphism.
并指出区域极低级变质作用是成岩-埋藏变质作用(造山前)和同造山变质作用的综合结果。
Regional very low grade metamorphism resulted from the combination of early diagenesis burial metamorphism (pre orogeny) and late syn orogeny metamorphism.
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